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Morro Rock
Westernmost Volcanic Plug in the Chain of "Nine Sisters"
Volcanic Plug
in
Morro Bay State Park
,
Coast Ranges
,
Morro Rock Ecological Preserve
in
Morro Bay
,
CA
Morro Rock is just one of over 20 volcanic plugs (aka volcanic necks) or domes in this part of San Luis Obispo, all dating between 20 and 26 million years old. Nine major volcanic peaks are locally known as the "Nine Sisters", outlined in a section below. Read more about this chain and other state park geologies in
Geological Gems of California State Parks (pdf)
.
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On Wikipedia
Morro Rock is a 581-foot (177 m) volcanic plug located just offshore from Morro Bay, California, at the entrance to Morro Bay Harbor. A causeway connects it with the shore, effectively making it a tied island. The area surrounding the base of Morro Rock can be visited. The rock is protected as the Morro Rock State Preserve. Climbing on the rock or disturbing the bird life is forbidden by law.
Read More on Wikipedia
Nine Sisters
In addition to Morro Rock, these eight other major peaks make up this chain from west to east:
Black Hill
Volcanic Plug
in
Morro Bay SP
,
Coast Ranges
in
Morro Bay
,
CA
Cerro Cabrillo
Volcanic Plug
in
Morro Bay SP
,
Coast Ranges
near
Morro Bay
,
CA
Hollister Peak
Volcanic Plug
in
Coast Ranges
near
Los Osos
,
CA
Cerro Romualdo
Volcanic Plug
in
ITC Camp San Luis Obisbo
,
Coast Ranges
near
San Luis Obispo
,
CA
Chumash Peak
Volcanic Plug
in
Coast Ranges
near
San Luis Obispo
,
CA
Bishop Peak
Volcanic Plug
in
Coast Ranges
in
San Luis Obispo
,
CA
Cerro San Luis Obispo
Volcanic Plug
in
Coast Ranges
near
San Luis Obispo
,
CA
Islay Hill
Volcanic Plug
in
Coast Ranges
in
San Luis Obispo
,
CA
Taxonomy
Classified As
Volcanic Plug
Geologic Formation
Tertiary intrusive rocks (hypabyssal), unit 4 (Tranquillon-Obispo) (CATi4;0)
Geologic Formation
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